How to use the @tarojs/taro-h5.PureComponent function in @tarojs/taro-h5
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NervJS / taro / packages / taro-components / src / components / canvas / index.js View on Github 
/**
* Canvas组件参数
* @typedef CanvasProps
* @property {String} [canvasId=canvas] 组件的唯一标识符
* @property {Boolean} [disableScroll=false] 当在 canvas 中移动时且有绑定手势事件时，禁止屏幕滚动以及下拉刷新
* @property {EventHandle} onTouchstart 手指触摸动作开始
* @property {EventHandle} onTouchmove 手指触摸后移动
* @property {EventHandle} onTouchend 手指触摸动作结束
* @property {EventHandle} onTouchcancel 手指触摸动作被打断，如来电提醒，弹窗
* @property {EventHandle} onLongtap 手指长按 500ms 之后触发，触发了长按事件后进行移动不会触发屏幕的滚动
* @property {EventHandle} onError 当发生错误时触发 error 事件，detail = {errMsg: 'something wrong'}
*/
@touchable()
class Canvas extends Taro.PureComponent {
/** @type {CanvasProps} */
static defaultProps = {
canvasId: '',
disableScroll: false,
onError: null
}
/** @type {CanvasProps} */
props
width = 300
height = 150
getWrapRef = ref => {
if (ref) this.wrapDom = ref
}
getCanvasRef = ref => {
if (ref) this.canvasRef = ref
